In recent cosmology, the Hubble constant problem has attracted much attention. As a possible solution to the problem, local variation of the expansion rate in an inhomogeneous cosmology has been proposed, where the spatial averaging over a finite domain was introduced in order to construct local Friedmann spacetime. However, the treatment was restricted to the comoving synchronous gauge and there is some confusion over the gauge ambiguity of the results. In this paper we study the spatial averaging in the Newtonian gauge in order to clarify the gauge ambiguity and obtain the same results as before.

中文翻译：

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对非均匀宇宙学中的平均和哈勃常数问题的评论

在最近的宇宙学中，哈勃常数问题备受关注。作为该问题的一种可能的解决方案，已经提出了非均匀宇宙学中膨胀率的局部变化，其中引入了有限域上的空间平均以构造局部弗里德曼时空。然而，该处理仅限于同动同步量规，并且对结果的量规模糊性存在一些混淆。在本文中，我们研究了牛顿规范中的空间平均，以澄清规范的模糊性并获得与以前相同的结果。